.GRO File Extension

Graphic Object Bitmap

Developer Hewlett-Packard
Popularity
3.3  |  7 Votes
 

What is a GRO file?

Bitmap image format sometimes referred to as a GROB (GRaphic Object Bitmap); used by Hewlett-Packard scientific calculators, such as the HP-48 and HP-49; used for storing graphs, charts, and other graphics created on the calculator.

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GRO files may be viewed on a computer using a supporting HP calculator emulator, such as Emu48.

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Programs that open GRO files

Mac
Free

Serious Engine Archive

Developer Croteam
Popularity
3.5  |  2 Votes
 

A GRO file may also be an archive used by games with the Croteam Serious Engine, including entries in the Serious Sam series. It is a renamed .ZIP archive that stores compiled game resource files in binary format for various elements, including levels, music, textures, logos, patches, and tools within the game.

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Screenshot of a .gro file in Apple Finder 13
GRO file open in Apple Finder 13

You will likely only encounter a GRO file if you are navigating the files of a game's installation directory. Typically, the only gamers navigating these files are modders looking to alter a game's gameplay.

For example, a game modder may install a Serious Sam game and find the SE1_10b.gro file, which stores the game's textures, in the installation directory. They then extract the texture files from the GRO archive to modify the appearances of objects in the game that use those textures.

How to open a GRO file

GRO files are not meant to be opened. Instead, the game packaged with them references them to load their game content.

Since GRO files are Zip-compressed, you can extract their contents with a Zip utility, such as 7-Zip or Corel Winzip. You can also decompress them in Windows with Microsoft Windows File Explorer or Apple Archive Utility on a Mac. You may need to rename the .gro file extension to .zip for the utility to recognize it.

Programs that open or reference GRO files

Windows
Mac
Included with OS
Linux
Free
Free
iOS
Included with OS
Chrome OS
Included with OS

Allegro MIDI File

Developer N/A
Popularity
3.0  |  2 Votes
 

ASCII text file that defines audio in a MIDI representation; also contains "note tracks," which specify display data for the audio; can be imported (and subsequently converted to other audio formats) using Audacity's File → Import MIDI... option.

Programs that open GRO files

Windows
Mac
Linux

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